Henry dreyfus



' cation.

- H NRY mantra-User Lennon, menu No Drawing.

To all fivhom it may concern:

, Be it known that LIIENRY DREYFUs, a citizenof the .Swiss Republic,residing at London, England, have invented certain new and usefulImprovements Relating to the Manufacture of Non-Inflammable Celluloid,of which the following is a specifi- This invention relates ofnon-inflammable celluloid.

In the manufacture of celluloid, after the celluloid material has beenrolled and cut 03, it is put into presses by which 1t is ressed intorectangular or cylindrlcal locks or-blocks of any other forms.

As. is known, in this process of pressing the celluloid. material, acertain pressure is used, which is generally the same, whether thepresses are usedfor, giving rectangular, cylindrical or. any other formsof blocks. The pressure usually employed is about 15Q kilograms persquare centimeter.

I have now found that by using much higher pressurethan that generallyhither to used, low inflammable celluloid can be obtained possessingother properties than the low inflammable celluloid produced un der theusual pressure.

With this object, according to my inven tion, the celluloid material issubjected to a pressure" higher by 100 per cent. or more, than thatusually employed; it may be even nrnnnrncrnnn or non-mammto themanufacture mixtures containing BLE cnrmurorto.

Specification of L'etters' Patent. I Patented Swept, IQI' HB,Application filed 311131131, 1915. Serial No. 247,496. I I

- several times as great as the usual pressure.-

That is to sayI employ pressures of from about 300 kilograms per squarecentimeter -.Ihe mater1al obtained by meansof the 1nvent1on 1sdlstinguished by possessing a much greater density and presenting a muchgreater resistance to influences su-chas cliloids having a basis ofnitro-cellulose or of stantial pro-portion.

What I claim and desire to secure by Letters Patent is: I i

1. In a process for the manufacture of nitro-cellu'l'ose insublow-inflammable celluloid, the 'method of subjecting the lowinflammable -celluloid material to a pressure of not less than about 300kilograms per square centimeter.

2. Ina process for "the manufacture of low-inflammable celluloid, themethod of subjecting the low-inflammable celluloid material having abasis of cellulose acetate to a pressure of not less than about 300kilograms per square centimeter.

In testimony whereof I have hereunto subscribed my name. HENRY DREYFUS.

